大气科学2018，Vol.42Issue(1)：70-80,11.DOI:10.3878/j.issn.1006-9895.1706.16284
春季西亚地表热力异常与初夏东北冷涡活动年代际变化的联系
Connection between Spring Land Surface Thermal Anomalies over West Asia and Decadal Variation of Early Summer Cold Vortex in Northeast China
摘要
Abstract
The cold vortex index in Northeast China is calculated by using the monthly station temperature data during 1979-2015 provided by the National Climate Center of China.In the present study,basic features of the cold vortex activity variation and its possible linkage with the springtime land surface thermal condition over west Asia are investigated.Results are as follows:(1) The intensity of the cold vortex in Northeast China displays a significant decadalfluctuation and an obvious decadal transition from positive phase (strong cold vortex) to negative (weak cold vortex) phase around 2000.(2) Decadal variation is also found in springtime land surface thermal condition over West Asia.The land surface was relatively cold before 2000 but became warm since then.(3) There is a close relationship between the decadal variations in early summer cold vortex and spring land surface thermal condition,i.e.,cold (warm) land surface corresponds to intensified (weakened) cold vortex.Further analysis suggests that anomalous land surface thermal forcing can result in abnormal general circulation and affect the cold vortex activity via the atmospheric teleconnection.However,the related physical mechanism needs further investigation in the future.关键词
东北冷涡/西亚地表热力异常/年代际变化Key words
Cold vortex in Northeast China/Land surface thermal anomalies over West Asia/Decadal variation分类
天文与地球科学引用本文复制引用
王迪,陈海山,赵昶昱..春季西亚地表热力异常与初夏东北冷涡活动年代际变化的联系[J].大气科学,2018,42(1):70-80,11.基金项目
国家自然科学基金项目41230422、41625019,公益性行业(气象)科研专项GYHY201206017,江苏省自然科学基金BK20130047 National Natural Science Foundation of China (Grants 41230422,41625019),Special Scientific Research Fund of Meteorological Public Welfare Profession of China (Grant GYHY201206017),Natural Science Foundation of Jiangsu Province (Grant BK20130047) （气象）
